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Exhibit A <br /> Water Treatment Chemicals — 1112-25 <br /> Estimated <br /> Yearly Usage Chemical Vendor Unit Price <br /> 1500 tons Alum USAlco $ 421.08/ton <br /> 450 tons Carbon—900 Thatcher Co. of Montana $1294.00/ton <br /> 475 tons Carbon Dioxide Continental Carbonics $ 58.50/ton <br /> 120 tons Chlorine Alexander Chemical $ 374.50/ton <br /> 225 tons Hydrofluosilicic Acid Pencco, Inc. $ 592.75/ton <br /> 350 tons Sodium Chloride Morton Salt $ 198.45/ton <br /> 300 tons Sodium Chlorite Siemens Water Tech. $ 876.00/ton <br /> 35 tons Sodium Hexametaphosphate Shannon Chemical Corp. $2044.47/ton <br />